<template>
	<view>
		<!-- 自定义搜索框 -->
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view">
			<!-- 左边一级导航栏 -->
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{height: wh + 'px'}">
				<block v-for="(item, i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>
			<!-- 右边二级 -->
			<scroll-view scroll-y="true" class="right-scroll-view" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key='i3' @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon" mode=""></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
				
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				wh: 0, // 高度
				cateList: [],
				active: 0,
				cateLevel2: [],
				scrollTop: 0, // 设置滚动条位置
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			// 调用获取分类列表数据的方法
			this.getCateList()
			
		},
		methods: {
			async getCateList() {
				const { data: res } = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			// 点击显示 状态
			activeChanged(i) {
				this.active = i
				// 为 二级分类列表重新赋值
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			// 点击三级分页跳转
			gotoGoodsList(item) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			// 搜索页面的点击事件
			 gotoSearch() {
				 uni.navigateTo({
					 url: '/subpkg/search/search'
				 })
			 }
		}
	}
</script>

<style lang="scss">
	.scroll-view {
		display: flex;
	}
	
	.left-scroll-view {
		width: 120px;
		
		.left-scroll-view-item {
			height: 60px;
			line-height: 60px;
			text-align: center;
			background-color: #F7f7f7;
			
			&.active {
				background-color: #ffffff;
				position: relative;
				
				&::before {
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					left: 0;
					top: 50%;
					transform: translateY(-50%);
				}
			}
		}
		
	}
	.cate-lv2-title {
	  font-size: 12px;
	  font-weight: bold;
	  text-align: center;
	  padding: 15px 0;
	}
	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item {
			width: 33.33%;
			margin-bottom: 10px;
			display: flex;
			flex-direction: column;
			align-items: center;
		}
		image {
			width: 60px;
			height: 60px;
		}
		text {
			font-size: 12px;
		}
	}
	
	
</style>
